A backplane port is a port between CIP Protocol Stacks
*1
in the CPU Unit or the NX-series Ether-
Net/IP Unit. The NX502 CPU Unit and NX-series EtherNet/IP Unit
each have two built-in CIP Proto-
col Stacks. CIP Protocol Stack1 is connected to the EtherNet/IP port 1 and CIP Protocol Stack2 is
connected to the EtherNet/IP port 2.
A communications port is an EtherNet/IP port on the NX-series EtherNet/IP Unit.
The network type numbers that are assigned to the backplane port and communications port are as
follows.
Port Network type number (hexadecimal)
Backplane port #01
Communications port #02
*1. A CIP Protocol Stack is a collection of communications protocols related to CIP message communications
that are gathered to perform the CIP message communications. The CIP Protocol Stack has the function
to send, receive, and transfer the communications data from one port to another port.
l
Destination Address
The destination address indicates the address of the Controller at the destination of the port or the
CIP Protocol Stack in the Controller. The destination address of the Controller is represented by the
IP address of the EtherNet/IP port on that Controller
. The destination address of the CIP Protocol
Stack is determined as follows.
Destination Unit Unit number CIP Protocol Stack Destination address (hexadecimal)
CPU Unit --- CIP Protocol Stack1 #00
CIP Protocol Stack2 #01
NX-series EtherNet/IP Unit 1 CIP Protocol Stack1 #10
CIP Protocol Stack2 #11
2 CIP Protocol Stack1 #20
CIP Protocol Stack2 #21
3 CIP Protocol Stack1 #30
CIP Protocol Stack2 #31
4 CIP Protocol Stack1 #40
CIP Protocol Stack2 #41
Route Path Notation Examples
The following gives examples of route path.
• Communicating from the EtherNet/IP port 1 on an
NX-series EtherNet/IP Unit to the EtherNet/IP port
1 on an NX701 CPU Unit
• Communicating from the EtherNet/IP port 2 on an NX-series EtherNet/IP Unit to CIP Protocol
Stack2 via the EtherNet/IP port 1 on an NX701 CPU Unit
• Communicating from the EtherNet/IP port 1 on an NX701 CPU Unit to the EtherNet/IP port 1 on an
NX-series EtherNet/IP Unit
• Communicating from the EtherNet/IP port 2 on an NX701 CPU Unit to CIP Protocol Stack1 via the
EtherNet/IP port 2 on an NX-series EtherNet/IP Unit
• Communicating from the EtherNet/IP port 1 on an NX-series EtherNet/IP Unit with unit number 2 to
the EtherNet/IP port 1 on an NX701 CPU Unit
10 CIP Message Communications
10-6
NX-series EtherNet/IP Unit User's Manual (W627)
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